US4347672A - Inflow bottom for a fluidized bed reactor - Google Patents

Inflow bottom for a fluidized bed reactor Download PDF

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Publication number
US4347672A
US4347672A US06/226,703 US22670381A US4347672A US 4347672 A US4347672 A US 4347672A US 22670381 A US22670381 A US 22670381A US 4347672 A US4347672 A US 4347672A
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US
United States
Prior art keywords
flow
floor
pocket
approach
approach flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US06/226,703
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English (en)
Inventor
Gregor Friedrichs
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thyssengas GmbH
Didier Engineering GmbH
Original Assignee
Thyssengas GmbH
Didier Engineering GmbH
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Filing date
Publication date
Application filed by Thyssengas GmbH, Didier Engineering GmbH filed Critical Thyssengas GmbH
Assigned to THYSSENGAS GMBH, DIDIER ENGINEERING GMBH reassignment THYSSENGAS GMBH ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FRIEDRICHS, GREGOR
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/1818—Feeding of the fluidising gas

Definitions

  • the invention concerns an approach flow floor for a fluidized bed reactor with approach flow nozzles in floor openings for feeding a charging gas into a fluidized bed above the approach flow floor.
  • a fluidized bed is usually produced by causing a carrier medium to undergo a pressure loss due to the flow resistance as it passes through fine-grained loose material, thereby exerting a force on the ballast.
  • Fluidized beds are used in various chemical processes. Fluidized beds are particularly suitable for certain processes as they make possible good temperature control and continuous operation, are distinguished by good heat transfer and high reaction speed and guarantee steadily uniform contact activity in catalytic processes. However it has been found that the introduction of materials, in particular charging gases, into the fluidized bed, causes difficulties.
  • sieve floors are known in conjunction with which the charging gas is blown in from below through the sieve openings at a certain speed.
  • a flow-back of solid particles takes place, already after a brief period of operation, from the fluidized bed through the openings in the sieve floor. This causes a narrowing and blocking of the sieve openings and also unwanted and, consequently, intolerable premature catalytic reactions which finally necessitate taking the fluidized bed out of service.
  • the invention is based on the problem of providing an approach flow floor with which blockages are reliably excluded and consequently unwanted premature reactions do not occur.
  • approach flow bodies each with a central approach flow hole, are disposed in the floor openings and a gas-permeable distributor plate is disposed on the approach flow body at a short distance above the discharge opening of the approach flow hole.
  • the relatively large-surfaced outflow of the charging gas results in a laminar flow of the gas flowing through the distributor plate and a largely homogeneous fluidized bed, whereby high relative speeds on the, for the most part, catalytically active solid particles are avoided. This causes a relatively slight abrasion of solid material.
  • the charging gas forms a uniform suspension phase with the fluidized bed, so that damaging local overheating in markedly exothermal reactions is avoided.
  • the distribution plate consists preferably of porous material. It is also advisable to use distributor plates made of thermally insulating material. This prevents a transition of heat from the fluidized bed compartment into the approach flow bodies and eliminates damaging premature reactions, particularly as the charging gas flowing into the approach flow bodies has a cooling effect. It is also advantageous for the distributor plates to consist of catalytically inert material, in order to prevent unwanted premature reactions.
  • the distributor plates should have discharge openings 10 to 200 times the size of any possible impurities. This ensures that, even when the charging gas is polluted, no blockages occur on the correspondingly large-pore plate distributors and uniform reliability of operation is guaranteed. As pulsation surges can be prevented, inter alia, it is ensured that no solid particles will get into the approach flow holes of the approach flow bodies from the fluidized bed in any operational or stationary phase, thus excluding all danger of blockage.
  • a pick-up pocket for the distributor plate may be located in the upper part of the approach flow body.
  • the approach flow hole can also open into the pick-up pocket via a conical widening.
  • the latter can be elastically mounted on spaces disposed in the pick-up pocket.
  • This packing consists preferably of themally insulating material which should also be catalytically inert.
  • a baffle plate can be disposed on the distributor plate above the conical widening. The approaching gas is hereby deflected out of the median region of the distributor plate.
  • FIG. 1 shows a cross-section through an approach flow floor
  • FIG. 2 shows an enlarged representation of a portion of FIG. 1.
  • An approach flow floor 2 with floor opening 3 is disposed in a fluidized bed reactor in which gas distributors 4 are located.
  • the gas distributors 4 consist of an approach flow body 5 and a distributor plate 6.
  • heat exchangers 7 are disposed for taking away the reaction heat generated by exothermal reactions.
  • the surfaces 9 of the approach flow floor 2 display an upward incline towards the reactor wall 1 between the distributor plates 6 and the reactor wall 1.
  • a pick-up pocket 12 is worked into the upper region of the approach flow body 5 in which the distributor plate 6 is mounted on elastic spacers 13.
  • a packing 15 of thermally insulating and catalytically inert material is disposed between the distributor plate 6 and the wall 14 of the approach flow body 5.
  • a mounting support 16 which projects into the pick-up pocket 12 so far that the distributor plate 6 cannot involuntarily lift out of its position is located some distance above the packing 15.
  • baffle plate 17 which is located at right angles above a conical widening 18 of an approach flow hole 19.
  • One basic body 5 is secured from beneath to the approach flow floor 2 by means of screws in holes 20, not shown.
  • the gasification gas passes out of the gas chamber 11 through the approach flow holes 19 of the gas distributors 4 into the conical widening 18 and from here, after deflection from the baffle boards 17 through the distributor plates 6 into the reaction chamber 10 above the approach flow floor 2 in which the fluidized bed is located.
  • the wedge-shaped elevations 8 and the sloping surfaces 9 of the approach flow floor 2 ensure that solid particles dropping out of the fluidized bed slide down to the distributor plates 6 and are carried back from here into the suspension phase 10 again.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Industrial Gases (AREA)
US06/226,703 1980-01-21 1981-01-21 Inflow bottom for a fluidized bed reactor Expired - Lifetime US4347672A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3001961A DE3001961C2 (de) 1980-01-21 1980-01-21 Anströmboden für einen Wirbelschichtreaktor
DE3001961 1980-01-21

Publications (1)

Publication Number Publication Date
US4347672A true US4347672A (en) 1982-09-07

Family

ID=6092525

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/226,703 Expired - Lifetime US4347672A (en) 1980-01-21 1981-01-21 Inflow bottom for a fluidized bed reactor

Country Status (4)

Country Link
US (1) US4347672A (enrdf_load_stackoverflow)
JP (1) JPS56115633A (enrdf_load_stackoverflow)
AU (1) AU542228B2 (enrdf_load_stackoverflow)
DE (1) DE3001961C2 (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4968492A (en) * 1988-08-19 1990-11-06 Charbonages De France Device for feeding fluidizing gas to the openings in a grid for supporting a bed of particles to be fluidized
US20100255099A1 (en) * 2007-10-26 2010-10-07 Rexahn Pharmaceuticals, Inc. Clavulanate formulation for neuroprotection and treatment of neurodegenerative disorders
US20110083593A1 (en) * 2009-10-12 2011-04-14 AirClean Technologies, Inc. Fluidized combustor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4841884A (en) * 1988-05-26 1989-06-27 A. Ahlstrom Corporation Distributor plate for fluidized bed reactor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3746516A (en) * 1970-03-10 1973-07-17 Thann Fab Prod Chem Sole plate for fluidized bed reactor
US3896560A (en) * 1973-06-18 1975-07-29 United States Steel Corp Two-stage fluidized bed reactor with nozzle tuyeres
US3995771A (en) * 1975-05-19 1976-12-07 Kaiser Aluminum & Chemical Corporation Feeding device for particulate matter

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5847216B2 (ja) * 1975-07-23 1983-10-21 バブコツク日立株式会社 チヨクレツタダンリユウドウソウガスブンサンソウチツキハンノウロ
JPS5743697Y2 (enrdf_load_stackoverflow) * 1979-03-30 1982-09-27

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3746516A (en) * 1970-03-10 1973-07-17 Thann Fab Prod Chem Sole plate for fluidized bed reactor
US3896560A (en) * 1973-06-18 1975-07-29 United States Steel Corp Two-stage fluidized bed reactor with nozzle tuyeres
US3995771A (en) * 1975-05-19 1976-12-07 Kaiser Aluminum & Chemical Corporation Feeding device for particulate matter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4968492A (en) * 1988-08-19 1990-11-06 Charbonages De France Device for feeding fluidizing gas to the openings in a grid for supporting a bed of particles to be fluidized
US20100255099A1 (en) * 2007-10-26 2010-10-07 Rexahn Pharmaceuticals, Inc. Clavulanate formulation for neuroprotection and treatment of neurodegenerative disorders
US20110083593A1 (en) * 2009-10-12 2011-04-14 AirClean Technologies, Inc. Fluidized combustor

Also Published As

Publication number Publication date
AU6651681A (en) 1981-07-30
JPS6312652B2 (enrdf_load_stackoverflow) 1988-03-22
DE3001961A1 (de) 1981-08-13
AU542228B2 (en) 1985-02-14
JPS56115633A (en) 1981-09-10
DE3001961C2 (de) 1984-08-16

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